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If you use this measurement often, measure your arm to see how close this measurement is to 1 yard.
One yard (36 inches or 92cm) is roughly the distance from your nose to the knuckle of your index finger (with your hand in a fist) on an outstretched arm. Four inches (10cm), or one hand width for measuring horses, is roughly the width of most people's hands measured across your bottom knuckles (without the thumb). After all, you should always have a thumb handy for a guide for measuring items under 6 inches (15cm)! In model miniatures, such as standard dollhouse scale (1:12), 1 inch is equal to roughly 1 foot.
Measure yours to see how close it is to 1 inch.
One inch (2.5 cm) is roughly the measurement from the top knuckle on your thumb to your thumb tip.